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Stock-Based Compensation - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2021 office $ / shares shares | Jun. 30, 2021 $ / shares shares | Mar. 31, 2021 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2020 $ / shares shares | Jun. 30, 2020 $ / shares shares | Mar. 31, 2020 $ / shares shares | Dec. 31, 2021 USD ($) purchasePeriod $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 50,000 |  |  |  |  |  |  | 0 | 0
Granted (in dollars per share) | $ / shares |  | $ 1.08 |  |  |  |  |  |  | $ 0 | $ 0
Restricted Stock Units (RSUs) - Non-Employee Directors |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock unit awards granted (in shares) | 368,672 |  |  |  | 50,000 | 39,426 |  |  |  |
Restricted stock unit awards grant date fair value (in dollars per share) | $ / shares | $ 1.35 |  |  |  |  | $ 1.28 |  |  | 1.35 |
Restricted Stock Units (RSUs) - Non-Employee Directors | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock unit awards granted (in shares) |  |  |  | 652,170 |  |  | 85,996 | 123,084 |  |
Restricted stock unit awards grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 1.22 |  |  | $ 0.71 | $ 1.25 |  |
Restricted Stock Units (RSUs) - Non-Employee Directors | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock unit awards granted (in shares) |  |  |  | 97,744 |  |  | 375,000 | 125,523 |  |
Restricted stock unit awards grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 1.22 |  |  | $ 0.67 | $ 1.25 |  |
Vesting period of award |  |  |  |  |  |  | 4 years |  |  |
Vesting percentage of award (as a percent) |  |  |  |  |  |  | 25.00% |  |  |
Restricted Stock Units (RSUs) - Team Members |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock unit awards granted (in shares) | 170,000 | 54,000 | 54,000 | 3,488,262 | 30,000 | 12,000 |  | 746,000 |  |
Restricted stock unit awards grant date fair value (in dollars per share) | $ / shares | $ 3.97 | $ 1.09 | $ 1.23 | $ 2.03 |  | $ 1.68 |  | $ 1.25 | $ 3.97 |
Vesting period of award | 47 months | 47 months | 47 months |  | 4 years | 4 years |  | 42 months |  |
Vesting percentage of award (as a percent) |  |  |  |  | 25.00% | 25.00% |  |  |  |
Restricted Stock Units (RSUs) - Team Members | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of award |  |  |  | 10 months |  |  |  |  |  |
Restricted Stock Units (RSUs) - Team Members | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of award |  |  |  | 51 months |  |  |  |  |  |
Restricted Stock Units (RSUs) - Non-Employees |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock unit awards granted (in shares) |  |  |  |  |  | 155,000 | 250,000 | 630,000 |  |
Restricted stock unit awards grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 0.85 | $ 1.52 | $ 0.67 | $ 0.88 |  | $ 0.85
Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of award |  | 1 year |  |  |  |  |  |  |  |
Number of equal monthly installments | office |  | 12 |  |  |  |  |  |  |  |
Aggregate intrinsic value of options | $ | $ 1,168,000 |  |  |  | $ 88,000 |  |  |  | $ 1,168,000 | $ 88,000
Total fair value for options | $ |  |  |  |  |  |  |  |  | $ 66,000 | $ 130,000
2018 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock shares (in shares) |  |  |  |  |  |  |  |  | 925,467,000 |
Common stock reserved for issuance (in shares) | 762,038 |  |  |  | 2,551,720 |  |  |  | 762,038 | 2,551,720
Unrecognized compensation expense | $ | $ 5,943,000 |  |  |  |  |  |  |  | $ 5,943,000 |
Amortization period of restricted stock cost |  |  |  |  |  |  |  |  | 2 years 8 months 12 days |
2018 Equity Incentive Plan | Employee Stock | Outstanding Shares on Last Day of Immediately Preceding Year |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual increase (in shares) | 2,729,416 |  |  |  |  |  |  |  | 2,729,416 |
Annual percentage increase | 5.00% |  |  |  |  |  |  |  | 5.00% |
2018 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | 189,215 |  |  |  | 272,942 |  |  |  | 189,215 | 272,942
Maximum payroll deductions (as a percent) | 15.00% |  |  |  |  |  |  |  | 15.00% |
Maximum yearly contribution | $ | $ 25,000 |  |  |  |  |  |  |  | $ 25,000 |
Maximum number of shares participant may purchase |  |  |  |  |  |  |  |  | 4,000 |
Offering period |  |  |  |  |  |  |  |  | 24 months |
Number of purchase periods | purchasePeriod |  |  |  |  |  |  |  |  | 4 |
Purchase period for award |  |  |  |  |  |  |  |  | 6 months |
ESPP, purchase price (as a percent) |  |  |  |  |  |  |  |  | 85.00% |
Unrecognized compensation expense | $ | $ 328,000 |  |  |  |  |  |  |  | $ 328,000 |
Amortization period of restricted stock cost |  |  |  |  |  |  |  |  | 1 year 6 months |
2018 Employee Stock Purchase Plan | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | 272,942 |  |  |  |  |  |  |  | 272,942 |
2018 Employee Stock Purchase Plan | Employee Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual increase (in shares) | 818,825 |  |  |  |  |  |  |  | 818,825 |
Outstanding shares of common stock on last day of immediately preceding year (as a percent) | 1.50% |  |  |  |  |  |  |  | 1.50% |
2009 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of award |  |  |  |  |  |  |  |  | 4 years |
Expiration period |  |  |  |  |  |  |  |  | 10 years |
Unvested shares (in shares) | 0 |  |  |  | 574 |  |  |  | 0 | 574
Accrued expenses | $ |  |  |  |  | $ 1,000 |  |  |  |  | $ 1,000
Unrecognized compensation expense | $ | $ 14,000 |  |  |  |  |  |  |  | $ 14,000 |
Amortization period of restricted stock cost |  |  |  |  |  |  |  |  | 3 months 18 days |

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